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bcachefs: Wrap vmap() in memalloc_nofs_save()/restore()

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vmalloc() and vmap() don't take GFP_NOFS - this should be pushed further
up the IO path, but for now just doing the simple fix.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-05-21 17:23:40 -04:00 committed by Kent Overstreet
parent 0d0e77f45f
commit a1b0da4555
1 changed files with 5 additions and 1 deletions
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6
fs/bcachefs/compress.c
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@ -7,6 +7,7 @@
#include "super-io.h"
#include <linux/lz4.h>
#include <linux/sched/mm.h>
#include <linux/zlib.h>
#include <linux/zstd.h>
@ -63,7 +64,7 @@ static struct bbuf __bio_map_or_bounce(struct bch_fs *c, struct bio *bio,
struct bbuf ret;
struct bio_vec bv;
struct bvec_iter iter;
unsigned nr_pages = 0;
unsigned nr_pages = 0, flags;
struct page *stack_pages[16];
struct page **pages = NULL;
void *data;
@ -103,7 +104,10 @@ static struct bbuf __bio_map_or_bounce(struct bch_fs *c, struct bio *bio,
__bio_for_each_segment(bv, bio, iter, start)
pages[nr_pages++] = bv.bv_page;
flags = memalloc_nofs_save();
data = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
memalloc_nofs_restore(flags);
if (pages != stack_pages)
kfree(pages);